Rotary protecting hood of a pneumatic grinder

ABSTRACT

The invention discloses a rotary protecting hood of a pneumatic grinder that comprises a connecting end disposed on a pneumatic grinder body, a grinder wheel disposed on the connecting end, and a protecting hood for sheltering the grinder wheel, wherein the connecting end includes a limit member, and the limit member and the protecting hood include a fixing section and a plurality of fixing holes for defining a fixing relation, and the limit member has a first position for defining a fixing relation with the protecting hood and a second position for releasing the fixing relation, such that the angle of the protecting hood can be adjusted and the protecting hood displaces with respect to the body. With the foregoing measure, a user can adjust the fixing position of the protecting hood according to the grinding position and the angle of a work piece to improve the convenience of operation.

FIELD OF THE INVENTION

The present invention relates to a rotary protecting hood of a pneumatic grinder, and more particularly to a rotary protective hood of a pneumatic grinder that uses a limit member and a protecting hood to constitute fixing and releasing relations.

BACKGROUND OF THE INVENTION

In the manufacturing and grinding industry that requires manual operations, a pneumatic grinder is an indispensable tool that features a low failure rate, an easy maintenance, a light weight and a small volume, and an easy and simple operation, etc, and thus the pneumatic grinder is extensively used. The prior art pneumatic grinder usually installs a protecting hold to a body at a position proximate to a grinder wheel for preventing the sparks, grinding bits, or dusts produced during the grinding process from hurting or contaminating the operator.

R.O.C. Patent Publication No. M257263 entitled “Pneumatic grinding tool” discloses a pneumatic grinder that comprises a long body and a short body, and the long body includes an operating section, a holding section, and a connecting head, and the operating section includes an air incoming module for allowing air to pass through, and the operating section includes a pressing section, and the long body is connected to the short body and includes a grinder wheel for providing the grinding function. The bottom surface of the connecting head connected to the grinder wheel and the bottom surface of the connecting head form an angle, such that the edge of the grinder wheel includes a protecting hood disposed proximate to a side of the long body of which the operator holds, so as to prevent the sparks and grinding bits from hurting or contaminating the operator.

However, the protecting hood of the foregoing prior art pneumatic grinding tool is in a fixed form and does not have the function of adjusting the position of the protecting hood. In a manufacture process, operators are usually forced to change the standing position or direction, or the operating pose to cope with the position or angle for the operation of grinding a work piece, and thus causing inconvenience to operators or making the operation more difficult, and greatly reducing the grinding quality. Therefore, we need a rotary protecting hood of a pneumatic grinder to prevent the sparks, grinding bits, or dusts produced in a grinding process from hurting or contaminating the operator, and the fixing position of the protecting hood can be adjusted according to the grinding position or angle of the work piece to make the manufacturing process easier and achieve the effect of improving the convenience of the operation.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to overcome the foregoing shortcomings and avoid the existing deficiencies by providing a rotary protecting hood of a pneumatic grinder capable of providing a protecting function as well as adjusting the fixing position of the protecting hood according to the grinding position and angle of the work piece.

To achieve the foregoing objective, the present invention installs a connecting end on the body, and the connecting end includes a grinder wheel and a protecting hood thereon, wherein the connecting end includes a limit member, and the limit member and the protecting hood include a fixing section and a plurality of fixing holes respectively, such that the limit member and the protecting hood constitute a fixing relation. The limit member includes a first position that constitutes a fixing relation with the protecting hood and a second position that constitutes a releasing relation with the protecting hood, such that the protecting hood displaces with respect to the body. With the foregoing measure, the rotary protecting hood of a pneumatic grinder allows users to change the fixing position of the protecting hood if needed to achieve the effects of improving the operator's convenience and enhancing the grinding quality.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the present invention;

FIG. 2 is an exploded view of a structure of the present invention;

FIGS. 3A and 3B are cross-sectional views of the present invention; and

FIGS. 4A to 4B are schematic views of an application of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The technical contents of the present invention will now be described in more detail hereinafter with reference to the accompanying drawings that show various embodiments of the invention.

Referring to FIGS. 1 and 2 for the perspective view and the exploded view of the present invention, the invention includes a body 10, and the body 10 includes a connecting end 20 thereon, and the connecting end 20 includes a grinder wheel 40 and a clamping member 90 for fixing the grinder wheel 40, and the clamping member 90 comprises a supporting base 91 and a locking member 92. The connecting end 20 includes a protecting hood 30 for sheltering the grinder wheel 40, a latching member 70 for pressing the protecting hood 30 such that the protecting hood 30 will not be loosened, and a supporting member 80 for supporting the latching member 70. The body 10 includes an accessory handle 13 disposed at a lateral side for providing another holding position of the body 10, and the rear end of the body 10 has an air incoming section 12 for passing high-pressure air, and the lower edge of the body 10 has a manual switch 11 for turning on or off the pneumatic grinder. During the operation, an operator holds the holding body 10 by a hand and the accessory handle 13 by the other hand to overcome the torque. If the operator presses the manual switch 11 at the upper end of the body 10, the high-pressure air will pass through the air incoming section 12 and the pneumatic motor (not shown in the figure) will drives the grinder wheel 40 to rotate in a high speed for performing the grinding and manufacturing processes. During the operation, the protecting hood 30 provides the function of protecting the operator, and a limit member 50 of the protecting hood 30 is installed at the connecting end 20 as shown in FIGS. 2 and 3A, and the limit member 50 and the protecting hood 30 include a fixing section 51 and a plurality of fixing holes 31 respectively for constituting a fixing relation, and a resilient member 60 having a resilience for storing power and resuming position is installed between the connecting end 20 and the limit member 50, and the connecting end 20 includes a depressed hole 15 corresponding to the resilient member 60 for limiting the resilient member 60, and the limit member 50 includes a pressing section 53 and a top pressing section 52 of the resilient member 60 for allowing the operator to apply a force.

Referring to FIGS. 3A and 3B for the cross-sectional views of the present invention, the limit member 50 includes a first position for defining a fixing relation with the protecting hood 30 (as shown in FIG. 3A) and a second position for defining a releasing relation with the protecting hood 30 (as shown in FIG. 3B), wherein the first position and second position of the limit member 50 are defined by the resilient member 60 disposed between the connecting end 20 and the limit member 50 and having a resilience for storing power and resuming position, and the resilient member 60 normally presses against the top pressing section 52 of the limit member 50 (as shown in FIG. 2), such that the fixing section 51 and the fixing hole 31 are connected with each other (the limit member 50 is situated at the first position) such that the limit member 50 and the protecting hood 30 form a fixing relation. If the operator applies a force at the pressing section 53 of the limit member 50, the fixing section 51 will be separated from the fixing hole 31 (the limit member 50 is situated at the second position) such that the limit member 50 and the protecting hood 30 release the fixing relation. The resilient member 60 can store power when the limit member 50 is situated at the second position for resuming the limit member 50 to the first position, if the applied force is released.

Referring to FIGS. 4A and 4B for a schematic view of an application of the present invention, if the limit member 50 is situated at the first position, the fixing section 51 and the fixing hole 31 of the protecting hood 30 are connected with each other, such that the limit member 50 and the protecting hood 30 constitute a fixing relation (as shown in FIGS. 3A and 4A). If the limit member 50 is situated at the second position as shown in FIG. 3B), the fixing section 51 will be separated from the fixing hole 31, such that the fixing relation between the limit member 50 and the protecting hood 30 is released, and the protecting hood 30 can displace with respect to the body 10 to change the fixing position of the fixing hole 31 (as shown in FIG. 4B), wherein the fixing hole 31 could be a circular through hole or a circular groove, and the fixing section 51 could be a protruded pillar, or the fixing hole 31 and the fixing section 51 have opposite structures. With the foregoing measure of the present invention, the fixing position of the protecting hood 30 can be adjusted according to the grinding position and angle of the work piece to improve the convenience of the operation.

While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims. 

1. A rotary protecting hood of a pneumatic grinder, comprising a connecting end disposed on a pneumatic grinder body, a grinder wheel disposed on said connecting end, and a protecting hood for sheltering said grinder wheel, said connecting end including a limit member installed at said protecting hood, said limit member and said protecting hood including a fixing section and a plurality of fixing holes for constituting a fixing relation, said fixing section directly contacts said protecting hood adjacent to said plurality of fixing holes, said limit member has a first position for defining a fixing relation with said protecting hood and a second position for releasing said fixing relation, such that said protecting hood is displaceable with respect to said pneumatic grinder body to change the fixing position of one of said plurality of fixing holes.
 2. The rotary protecting hood of a pneumatic grinder of claim 1, wherein said first position and said second position of said limit member are defined by a resilient member disposed between said connecting end and said limit member for storing power and resuming position.
 3. The rotary protecting hood of a pneumatic grinder of claim 2, wherein said connecting end includes a depressed hole corresponding to said resilient member for limiting the position of said resilient member.
 4. The rotary protecting hood of a pneumatic grinder of claim 2, wherein said limit member includes a pressing section and a top pressing section of said resilience member for a user to apply a force.
 5. The rotary protecting hood of a pneumatic grinder of claim 1, wherein said plurality of fixing holes of said protecting hood are circular through holes and said fixing section is a protruded pillar.
 6. The rotary protecting hood of a pneumatic grinder of claim 2, wherein said resilient member is a coil spring.
 7. The rotary protecting hood of a pneumatic grinder of claim 2, wherein said resilient member contacts said limit member at a point.
 8. The rotary protecting hood of a pneumatic grinder of claim 1, wherein said pneumatic grinder body has a front side and a rear side and side protecting hood is located next to said front said pneumatic body and said pressing section extends toward said front side of said pneumatic grinder body. 